Buy Provigil Dosage Online has been shown to be an effective treatment for severe fatigue associated with narcolepsy and other sleep disorders, including obstructive sleep apnea, which disrupts normal breathing patterns during sleep. Additionally, this medication can assist individuals suffering from shift work sleep disorder and those with irregular work hours in maintaining alertness throughout the day. However, it is important to note that Provigil may not entirely eliminate feelings of drowsiness and is not a comprehensive solution for all sleep-related issues.